103 lines
5.2 KiB
C
103 lines
5.2 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
- Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
***********************************************************************/
|
|
#include "opus/opus_config.h"
|
|
|
|
#include "opus/silk/main.h"
|
|
|
|
/* Limit, stabilize, convert and quantize NLSFs */
|
|
void silk_process_NLSFs(
|
|
silk_encoder_state *psEncC, /* I/O Encoder state */
|
|
opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */
|
|
opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */
|
|
const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */
|
|
)
|
|
{
|
|
opus_int i, doInterpolate;
|
|
opus_int NLSF_mu_Q20;
|
|
opus_int32 i_sqr_Q15;
|
|
opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
|
|
opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ];
|
|
opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
|
|
|
|
silk_assert( psEncC->speech_activity_Q8 >= 0 );
|
|
silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
|
|
silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
|
|
|
|
/***********************/
|
|
/* Calculate mu values */
|
|
/***********************/
|
|
/* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */
|
|
NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
|
|
if( psEncC->nb_subfr == 2 ) {
|
|
/* Multiply by 1.5 for 10 ms packets */
|
|
NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
|
|
}
|
|
|
|
silk_assert( NLSF_mu_Q20 > 0 );
|
|
silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
|
|
|
|
/* Calculate NLSF weights */
|
|
silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
|
|
|
|
/* Update NLSF weights for interpolated NLSFs */
|
|
doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
|
|
if( doInterpolate ) {
|
|
/* Calculate the interpolated NLSF vector for the first half */
|
|
silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
|
|
psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
|
|
|
|
/* Calculate first half NLSF weights for the interpolated NLSFs */
|
|
silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
|
|
|
|
/* Update NLSF weights with contribution from first half */
|
|
i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
|
|
for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
|
|
pNLSFW_QW[ i ] = silk_SMLAWB( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), (opus_int32)pNLSFW0_temp_QW[ i ], i_sqr_Q15 );
|
|
silk_assert( pNLSFW_QW[ i ] >= 1 );
|
|
}
|
|
}
|
|
|
|
silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
|
|
NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
|
|
|
|
/* Convert quantized NLSFs back to LPC coefficients */
|
|
silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder );
|
|
|
|
if( doInterpolate ) {
|
|
/* Calculate the interpolated, quantized LSF vector for the first half */
|
|
silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
|
|
psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
|
|
|
|
/* Convert back to LPC coefficients */
|
|
silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder );
|
|
|
|
} else {
|
|
/* Copy LPC coefficients for first half from second half */
|
|
silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
|
|
}
|
|
}
|